# 成员运算符   in  和  not  in   (掌握)
'''

list1 = [12,345,678,93]
print(121 in list1)   # False
print(12 in list1)    # True
print(987 not in list1) # True
str1 = "I love you forever"
print("love" in str1)  # True
print("hello" not in str1)  #True

'''
# 身份运算符  is 和 is not   主要用于判断内存地址是否相同 (了解)
# id()   获取内存地址
x = 12
y = 124
z = 12
print(id(x))
print(id(y))
print(id(z))

print(x is z)   # True
print(x is y)   # False
print(x is not y)  # True

